Lightning-rod and coupling



1 (NoModeL) S. R. LAWSHE.

LIGHTNING ROD AND COUPLING.

No. 400,464. Patelited Apr. 2. 1889.

' ters and figures of reference marked thereon UNITED STATES PATENTOFFICE.

SPENCER R. LAIVSI'IE, OF CHICAGO, ILLINOIS.

LIGHTNING-ROD AND COUPLING.

SPECIFICATION formingpart of Letters Patent No. 400,464, dated April 2,1889. Application filed October 15, 1888. Serial No. 288,17 6. (N0model.)

To all whom it may concern.-

Be it known that I, SPENCER R. LAWSHE, a citizen of the United States,residing in the city of Chicago, county of Cook, and State of Illinois,have invented certain new and useful Improvements in Lightning- Rods andLightning-Rod Couplings; and I do hereby declare the following to beaclear, full, and exact descriptionthereof, reference being had to theaccompanying drawings, and to the let- 7 which form part of thisspecification.

My invention relates to lightning-rods which I put together in sections;and it consists in the method of fastening the coupling-burr to theseveral sections of the rod.

Figure 1 represents a portion of the spiral section of a lightning-rodhaving a tenon, A, at the end, with shoulders I) b, which tenon Iprefermaking by cutting the section of the rod to the depth of theflanges a sufficient distance from the end to give the required lengthof tenon and turning each portion of the flange so out upon itself, soas to form the shoulders I) b, as shown in 2. Fig. 3 represents acoupling-burr having a male and female screw, the ends of which areprovided with serrated flanges C C, having shoulders cl d, as shown in aperspective view of the lower end of the coupling. The end of thecoupling is passed over the tenon A a suificient distance, so that, whenthe flanges C C are forced down against the rod the shoulders 01 (Z lockwith the shoulders Z) Z) and form a perfect union, preventing thecoupling from slipping or breaking from the rod. Fig. 4 represents avertical section of the two parts of the coupling-burr joined and theflanges C C forced down against the rod, a portion of the flanges of therod being broken away to show the shoulders 17 I), held in theirposition by the shoulders (Z (Z of the coupling-burr.

I do not confine myself to any particular form of rod or method ofmaking the same. The rod maybe composed of one material, or two or more,and of any form desired,

What I claim as my invention, and desire to secure by Letters Patent, is

A coupling-burr provided at its ends with serrated flanges C C, havingshoulders (Z d, which shoulders lock with the shoulders Z) Z) of thetenon A upon the flanges C C being forced down on the rod, allsubstantially as and for the purpose set forth.

SPENCER R. LA\VSHE.

WVitnesses;

W. S. GARY, FREDK. H. MILLS.

